This high shank foot is suitable for use with various straight sew industrial machines, enabling the needle to stitch near the edge of the zipper. The Metal Invisible Zipper high shank Foot features grooves on the bottom to promote smooth movement of the zipper coils. Commonly found in the back of dresses, on the sides or backs of pants and skirts, and in some home decor projects, Invisible Zippers (also known as concealed zippers) are hidden within the seam, providing a nearly invisible look. Despite its reputation as a challenging task, this zipper application is surprisingly simple.